Magnetodynamics of a multicomponent (dusty) plasma. II. Magnetic drift waves in an inhomogeneous medium

Details Magnetodynamics of a multicomponent (dusty) plasma. II. Magnetic drift waves in an inhomogeneous medium Magnetodynamics of a multicomponent (dusty) plasma. II. Magnetic drift waves in an inhomogeneous medium

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phpl...12d2111r&link_type=abstract

Physics of Plasmas, Volume 12, Issue 4, pp. 042111-042111-9 (2005).

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Magnetohydrodynamics, Dusty Or Complex Plasmas, Plasma Crystals, Plasma Properties, Drift Waves, Macroinstabilities, Nonlinear Phenomena: Waves, Wave Propagation, And Other Interactions, Electrostatic Waves And Oscillations, Laboratory Studies Of Space- And Astrophysical-Plasma Processes, Magnetohydrodynamics And Plasmas, Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds, Origin, Formation, Evolution, Age, And Star Formation

Scientific paper

The electromagnetic oscillations near the low-frequency cutoff (the rotation waves) and their stability and nonlinear state, analyzed in the companion paper [G. Ganguli and L. Rudakov, Phys. Plasmas 12, 042110 (2005)] for a homogeneous plasma, are generalized to include inhomogeneity in the equilibrium density and magnetic field. It is shown that in the forbidden frequency band below the cutoff the magnetic drift waves appear, which can exist even in a cold plasma. The magnetic drift wave and nonlinear structures associated with it are analyzed and their relevance to astrophysical plasmas are discussed. It is found that in an inhomogeneous plasma the rotation wave packets can couple to the magnetic drift waves. The behavior of such structures is governed by nonlinear Schrödinger equation. The spatial scale of the nonlinear structures due to the magnetic drift waves in astrophysical plasmas such as dense molecular clouds, which are the regions of star creation, is estimated to be around 10 a.u.

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